From dc6abe86d2730b16cb155a02b3ec9d79fcaa72f7 Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Mon, 5 Jul 2010 09:49:42 +0000
Subject: Make server write its pid file. Daemon class ported from pentominos.

---
 server/src/daemon.cc | 67 ++++++++++++++++++++++++----------------------------
 1 file changed, 31 insertions(+), 36 deletions(-)

(limited to 'server/src/daemon.cc')

diff --git a/server/src/daemon.cc b/server/src/daemon.cc
index 6aed66e..9de3807 100644
--- a/server/src/daemon.cc
+++ b/server/src/daemon.cc
@@ -3,7 +3,7 @@
  *            daemon.cc
  *
  *  Thu Jun  9 10:27:59 CEST 2005
- *  Copyright  2005 Bent Bisballe
+ *  Copyright  2005 Bent Bisballe Nyeng
  *  deva@aasimon.org
  ****************************************************************************/
 
@@ -41,13 +41,13 @@
 // For strcmp
 #include <string.h>
 
-/* Resolve a group's name or id into a numeric gid */
+// Resolve a group's name or id into a numeric gid
 static gid_t get_gid(const char *grp)
 {
   char *eptr;
   gid_t xid = strtoul(grp, &eptr, 10);
   struct group *gr;
-  errno = 0;      /* Per getgrnam(3) and getgrgid(3) manual page */
+  errno = 0;      // Per getgrnam(3) and getgrgid(3) manual page
   if(!*eptr)
     gr = getgrgid(xid);
   else
@@ -55,13 +55,13 @@ static gid_t get_gid(const char *grp)
   return !gr ? 0 : gr->gr_gid;
 }
 
-/* Resolve a user's name or id into a numeric uid with associated gid */
+// Resolve a user's name or id into a numeric uid with associated gid
 static uid_t get_uid(const char *usr, gid_t *gid)
 {
   char *eptr;
   uid_t xid = strtoul(usr, &eptr, 10);
   struct passwd *pw;
-  errno = 0;      /* Per getpwnam(3) and getpwuid(3) manual page */
+  errno = 0;      // Per getpwnam(3) and getpwuid(3) manual page
   if(!*eptr)
     pw = getpwuid(xid);
   else
@@ -79,11 +79,9 @@ Daemon::Daemon()
 Daemon::~Daemon()
 {}
 
-int Daemon::run(const char *user, const char* group, bool detach)
+int Daemon::run(const char *user, const char* group, bool detach,
+                std::string pidfile)
 {
-  //  int f;
-  int fd;
-
   // Fetch user and group IDs
   gid_t gid = 0;
   uid_t uid = 0;
@@ -103,30 +101,32 @@ int Daemon::run(const char *user, const char* group, bool detach)
     }
   }
 
-  if(chdir("/")) {
-    fprintf(stderr, "Could not chdir to / : %s\n", strerror(errno));
-  }
   umask(0);
 
   if(detach) {
-    switch(fork()) {
-    case -1: // Fork error
-      perror("Fork in daemon.cc");
-      return 1;
-      
-    case 0:  // Forked child
-      break; // Break out of switch
-      
-    default: // Parent
-      // exit(0);
-      return 0;
+    if( daemon(0, 0) == -1) { 
+      perror("");
+      return -1; 
+    }
+  }
+
+  if(pidfile != "" ) {
+    pid_t pid = getpid();
+    FILE *fp = fopen(pidfile.c_str(), "w");
+    if(errno) {
+      fprintf(stderr, "Could not write pid file \"%s\"", pidfile.c_str());
+      perror("");
+    } else {
+      fprintf(fp, "%lu", (unsigned long int)pid);
+      fclose(fp);
     }
   }
 
   if(gid) {
     // Switch to given group
     if(setgid(gid) != 0) {
-      fprintf(stderr, "Failed to change to group \"%s\" (gid: %d), quitting.\n", group, gid);
+      fprintf(stderr, "Failed to change to group \"%s\" (gid: %d).\n",
+              group, gid);
       perror("");
       fprintf(stderr, "Runnning daemon as current group\n");
     }
@@ -135,26 +135,21 @@ int Daemon::run(const char *user, const char* group, bool detach)
   if(uid) {
     // Switch to given user
     if(setuid(uid) != 0) {
-      fprintf(stderr, "Failed to change to user \"%s\" (uid: %d), quitting.\n", user, uid);
+      fprintf(stderr, "Failed to change to user \"%s\" (uid: %d).\n",
+              user, uid);
       perror("");
       fprintf(stderr, "Runnning daemon as current user\n");
     }
   }
-  
-  // Redirect stdin, stdout and stderr to /dev/null
-  fd = open("/dev/null", O_NOCTTY | O_RDWR, 0666);
-  
-  dup2(0, fd);
-  dup2(1, fd);
-  dup2(2, fd);
-    
-  close(fd);
 
   setsid();
 
   signal (SIGTERM, SIG_IGN);
-  //  signal (SIGHUP, SIG_IGN);
-  if(detach) signal (SIGINT, SIG_IGN); // Don't disable Ctrl+c when running in foreground.
+
+  //signal (SIGHUP, SIG_IGN);
+
+  // Don't disable Ctrl+c when running in foreground.
+  //if(detach) signal (SIGINT, SIG_IGN);
 
   return daemon_main();
 }
-- 
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